Unreviewed, rolling out r173340 and r173342.
https://bugs.webkit.org/show_bug.cgi?id=136596

Broke many tests (Requested by ap on #webkit).

Reverted changesets:

"Remove PLATFORM(IOS) from WebCore/editing (Part 3)."
https://bugs.webkit.org/show_bug.cgi?id=136474
http://trac.webkit.org/changeset/173340

"Build fix after r173340."
http://trac.webkit.org/changeset/173342

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@173351 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Unreviewed, rolling out r173335.
https://bugs.webkit.org/show_bug.cgi?id=136597

Broke webgl/1.0.2/conformance/glsl/misc/shader-varying-
packing-restrictions.html (Requested by ap on #webkit).

Reverted changeset:

"Remove statically used varyings from packing restrictions
check."
https://bugs.webkit.org/show_bug.cgi?id=136585
http://trac.webkit.org/changeset/173335

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@173352 268f45cc-cd09-0410-ab3c-d52691b4dbfc